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Organism
  Plantae
      Tracheophyta
            Magnoliopsida
                    Sapindales
                            Simaroubaceae
                                     Ailanthus
                                             Ailanthus altissima
                                                   [Ailanthus glandulosa]
                                     Castela
                                             Castela emoryi
                                                   [Holacantha emoryi]
                                             Castela erecta
                                               Castela erecta subsp. erecta
                                                     [Castelaria nicholsonii]
                                               Castela erecta subsp. texana
                                                     [Castela texana]
                                                     [Castela tortuosa]
                                             Castela stewartii
                                                   [Holacantha stewartii]
                                     Castelaria
                                     Holacantha
                                     Leitneria
                                             Leitneria floridana
                                             Leitneria pilosa
                                               Leitneria pilosa subsp. ozarkana
                                               Leitneria pilosa subsp. pilosa
                                     Picrasma
                                             Picrasma excelsa
                                                   [Aeschrion excelsa]
                                                   [Quassia excelsa]
                                     Quassia
                                             Quassia amara
                                     Simarouba
                                             Simarouba glauca
                                               Simarouba glauca var. latifolia
                                             Simarouba tulae
                                     Simpsonia